Relative Risk Reduction (RRR) - naplex practice calculations- biostatistics

A clinical trial is published about a new drug, NOPAINZ, for pain reduction. There are 200 patients randomized; 100 patients to NOPAINZ and 100 patients to placebo. The study found that pain was alleviated in 90 patients taking NOPAINZ and in 50 patients taking placebo. Calculate the relative risk reduction (RRR) in this trial. (Enter the relative risk reduction as a decimal, not a percentage.)

Correct answer: 0.8
Relative risk reduction (RRR) = 1-RR (relative risk). The relative risk is 0.2. Therefore, 1-0.2 = 0.8.